docs(opener): fix openUrl example name

[saintwinkle]

Description

Fixed incorrect function name in opener plugin JavaScript example. The code imports openUrl but incorrectly calls openURL.

-await openURL('https://tauri.app');
+await openUrl('https://tauri.app');

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[Copilot]

Pull request overview

This PR fixes a documentation bug in the opener plugin example where the function call used incorrect casing. The import statement correctly uses openUrl (camelCase), but the example code incorrectly called openURL (with uppercase "URL").

• Corrected function name from openURL to openUrl in JavaScript example

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[FabianLars]

thanks :)